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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11777

Title: Frequency-dependence of electric double layer capacitance of TiO2-based composite nanotube arrays
Authors: Zhao, Xiaoyu
Wang, Yanfei
Zhu, Yuxiang
Zhu, Liang
Yang, Libin
Hou, Yongdan
Sha, Zuoliang
Keywords: Double layer capacitance
Composite nanotube arrays
Frequency-dispersion
Constant phase element
Issue Date: 15-Oct-2016
Publisher: Elsevier (Journal of Electroanalytical Chemistry)
Citation: Xiaoyu Zhao, Yanfei Wang, Yuxiang Zhu, Liang Zhu, Libin Yang, Yongdan Hou, Zuoliang Sha. Frequency-dependence of electric double layer capacitance of TiO2-based composite nanotube arrays. Journal of Electroanalytical Chemistry Volume 779, 15 October 2016, Pages 199-206
Abstract: The electric double layer capacitances for a series of titanium dioxide based composite nanotube-arrays (TNTAs, Pt/TNTAs, CdS/TNTAs, CdS/Pt/TNTAs) in aqueous solutions were examined at the polarized potential. As a result, the capacitance increases with a decrease in the ac-frequency, obeying the inverse of the power law of the frequency. The power law is demonstrated to be equivalent to the constant phase element. The intensity of frequency dispersion varies with nanoarrays as to different nano architectonics and materials. The CdS coated TNTAs yield the largest specific capacitance of 2.33 mF cm− 2 at a frequency of 1 Hz, which is about 9 times higher than the capacitance obtained from bare TNTAs at the same condition. The coating of Pt, however, shows less capacitive behavior with more obvious frequency-dispersion.
Description: Research article
URI: http://hdl.handle.net/123456789/11777
Appears in Collections:College of Engineering

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